[ghlkal]

Originally Posted by scottfab

I guess I would just have used a trim pot and left it that way.

You're right, scottfab, this would be a better solution. I did replace the pot with 220K worth of resistors. I used one 220K plus three 1K ohm resistors in series. Because they are +- 5%, the 223K stated value was actually 220K. The tach works great now!

Here’s the thread containing Paul’s instructions for fixing the tach (for future reference)
http://www.zr1.net/forum/showthread.php?t=17728